Publication Workflow lets you set up a simple workflow in just a few clicks. People will be able to fill requests via a Google Form, you'll receive an email notification and you'll be able to approve or reject the request via email (you can even leave a comment / feedback for the requestor).
All approved requests are visible in an Awesome Table view that you can insert in any website / intranet (that's why it's a publication workflow - all form submissions that you have approved are automatically published).

It works on mobile too! The Google Form to let people submit requests / proposals is of course 100% mobile friendly, but also our email notifications, the Awesome Table view and our UI to view all pending requests, workflows,... (using Material Design).